ordering of LaMnO3±δ perovskites. Changing the oxygen composition within the range
2.995< 3±δ< 3.140, we found a 3+ δ1 value (3.04< 3+ δ1< 3.05) which defines a boundary
in the magnetic phase diagram T vs 3±δ. For 3+ δ< 3+ δ1, antiferromagnetic order is present
in the samples with a small ferromagnetic component, while for large 3+ δ values (3+ δ> 3+
δ1) the samples are ferromagnetic. The transition from one region to the other is associated …